<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="/day02/002.php" ></script>
    <script>
        function doSome() {
            console.log('a:', a);
        }
    </script>
</head>
<body>
    <button onclick="doSome()" >doSome</button>
</body>
</html>